Chevrolet Silverado / GMC Sierra. Manual - part 353
Fig. 423: Identifying Piston Damage Inspection Areas
Courtesy of GENERAL MOTORS CORP.
5. Inspect the piston for the following conditions:
Cracks in the piston ring lands, the piston skirt, or pin bosses
Piston ring grooves for nicks, burrs, or warpage which may cause the piston ring to
bind
MINOR imperfections may be removed from the piston with a fine file.
2008 Hummer H2
2008 ENGINE Engine Mechanical - 6.2L - H2
Eroded areas at the top of the piston (1)
Scuffed or damaged skirts (2)
Scoring to the piston pin bore (3) or piston pin
Fig. 424: Inserting Piston Ring Into Ring Groove
Courtesy of GENERAL MOTORS CORP.
6. Insert the edge of the piston ring into the piston ring groove.
Roll the piston ring completely around the piston. If binding is caused by a distorted ring
groove, MINOR imperfections may be removed with a fine file. If binding is caused by a
2008 Hummer H2
2008 ENGINE Engine Mechanical - 6.2L - H2
distorted piston ring, replace the rings, as required.
Fig. 425: Measuring Piston Ring Side Clearance
Courtesy of GENERAL MOTORS CORP.
7. Measure the piston ring side clearance with a feeler gage. If side clearance is not within
specifications, try another piston ring. If the proper ring-to-groove clearance cannot be
obtained, replace the piston and pin as an assembly. Refer to Engine Mechanical
Specifications.
2008 Hummer H2
2008 ENGINE Engine Mechanical - 6.2L - H2
